That is correct this is his last year. Guy had put out a request for anyone that would be interested in helping him work on the calendar early this year and I dropped an email stating I would be happy to help out. He responded and declined as this was his last year (2013). So enjoy, as it is bound to be a classic.

Bringing this up again, Reflector, the Astronomical League's Magazine, has a two page (pgs 10 & 11) write up on Guy Ottewell and the Astronomical Calendar. He says the "Astronomical Calendar 2014 will return to the letter-size format of the first." So it sounds as if the Calendar will live another year or more just in a different format.